Question

りぴ

訳はだいたいできたのですが、内容理解がいまいちできません…どなたか説明していただきたいです‼︎

490. With the effort /it would require to jump three feet into
V
the air on earth/ he could jump to a height of eighteen feet above
the lunar surface./ If he zwanted to run back to the space ship in
an emergency, /he might find himself taking great leaping strides of
(横浜国立大)
5
曜ある
twenty, or perhaps even forty, feet.